
III. Ecosmos: A Revolutionary Fertile, Habitable, SolarBioplanet, Incubator Lifescape1. Quantum Cosmology Theoretic Unity Greene, Brian. The Hidden Reality: Parallel Universes and the Deep Laws of the Cosmos. New York: Knopf, 2011. The Columbia University physicist surely does communicate such far outer reaches and dimensions of theoretical imaginations with verve and veracity. Quilted, Inflationary, Brane, Cyclic, Landscape, Quantum, Holographic, Simulated, and Ultimate Multiverse options are clearly explained, amidst their wonderment. But, but, as per the quote, in this so declared final Copernican displacement, as if physics disappearing into its own, selfmade black hole, all human hopes, sensibilities and reprieves of a meaningful destiny are to be abandoned. Rather, what’s gratifying about being human, what’s exciting about being part of the scientific enterprise, is our ability to use analytical thought to bridge vast distances, journeying to outer and inner space, if some of the ideas we’ll encounter in this book prove correct, perhaps even beyond our universe. For me, it is the depth of our understanding, acquired from our lonely vantage point in the inky black stillness of a cold and forbidding cosmos, that reverberates across the expanse of reality and marks our arrival. (8) Guth, Alan. The Inflationary Universe. Reading, MA: AddisonWesley, 1997. A sudden expansion of the cosmic singularity in its first seconds is proposed by the MIT cosmologist to resolve mathematical and observational disagreements, which has now become the generally accepted model. Guth, Alan and David Kaiser. Inflationary Cosmology: Exploring the Universe from the Smallest to the Largest Scales. Science. 307/884, 2005. A thorough survey of the latest theories and observations in this regard prepared for the International Year of Physics.
Habib, Salman, et al.
HACC: Extreme Scaling and Performance across Diverse Architectures.
Communications of the ACM.
60/1,
2017.
A 13 member team from Argonne, Los Alamos, and Berkeley Lawrence National Laboratories describe frontier computational capacities by which our worldwide sapience can achieve a cosmic selfquantification of infinite celestial environs. Supercomputing is evolving toward hybrid and acceleratorbased architectures with millions of cores. The Hardware/Hybrid Accelerated Cosmology Code (HACC) framework exploits this diverse landscape at the largest scales of problem size, obtaining high scalability and sustained performance. Developed to satisfy the science requirements of cosmological surveys, HACC melds particle and grid methods using a novel algorithmic structure that flexibly maps across architectures, including CPU/GPU, multi/manycore, and Blue Gene systems. In this Research Highlight, we demonstrate the success of HACC on two very different machines, the CPU/GPU system Titan and the BG/Q systems Sequoia and Mira, attaining very high levels of scalable performance. (Abstract) Hartle, James. Arrows of Time and Initial and Final Conditions in the Quantum Mechanics of Closed Systems Like the Universe. arXiv:2002.07093. We choose this recent entry by the UC Santa Barbara physicist to recognize his decadal flow of papers about the so mathematical matters of melding quantum depths with cosmic breadth. The third abstract is from a 1990 Jerusalem Winter School and well catches this human unification of depth and breadth. See also, for example, The Impact of Cosmology on Quantum Mechanics (1901.03933) and The Quantum Mechanics of Cosmology (1805.12246), abstracts below, for his oriented agenda. In a quantum universe, arrows of time are described by the probabilities of appropriately coarse grained sets of histories of quantities like entropy that grow or decay. We show that the requirement of that these sets of histories decohere implies two things: (1) A time asymmetry between initial and final conditions that is a basis for arrows ot time. (2) How a final state of indifference that is represented by a final density matrix proportional to the unit density matrix is consistent with causality, and allows a finergrained description of the model universe in terms of decoherent histories than any other final state. (Abstract, 2002.07093) Hartle, James. How Nature is Conformable to Herself: A View from Quantum Cosmology. arXiv:1909.08724. The UC Santa Barbara physicist and often collaborator with his advisor the late Nobel laureate Murray GellMann (19292019) comments on his 1996 article with the above title (Complexity 1/4) in which he, as did Newton from whom the phrase comes, avers a persistent innate recurrence in kind from universe to us. A metaphor is layers of onion skin – a natural genesis conforms to and reiterates the same “complex adaptive system” at each and every stage (see his 1994 The Quark and the Jaguar). Circa 2019, Hartle indeed cites a universality of emergent, mathematical simplicity, regularity and complexity from its quantum dynamics source. See George Johnson’s N. Y. Times obit (May 25) where he also notes Murray’s long advocacy of a sensible cosmos which opens to our comprehension. In his essay "Nature Conformable to Herself" the late Murray GellMann expands on an observation of Newton that theories of seemingly disparate phenomena in the universe often make use of similar ideas and similar mathematical structure. Newton summarized that by saying that nature was very consonant and conformable to herself. This essay uses a model of quantum cosmology to illustrate how, why, and when nature is conformable to herself. (Hartle Abstract) Hartle, James, et al. Accelerated Expansion from Negative Lambda. arXiv:1205.3807. Coauthors are Stephen Hawking and Thomas Hertog, posted on May 30, 2012. As reported by Amanda Gefter in New Scientist for June 30, noted above, a proposal by these veteran physicists to resolve piled up inconsistencies with older inflationary and string theories by way of a holographic theory solution. Wave functions specifying a quantum state of the universe must satisfy the constraints of general relativity, in particular the WheelerDeWitt equation (WDWE).We show for a wide class of models with nonzero cosmological constant that solutions of the WDWE exhibit a universal semiclassical asymptotic structure for large spatial volumes. A consequence of this asymptotic structure is that a wave function in a gravitational theory with a negative cosmological constant can predict an ensemble of asymptotically classical histories which expand with a positive effective cosmological constant. This raises the possibility that even fundamental theories with a negative cosmological constant can be consistent with our lowenergy observations of a classical, accelerating universe. We illustrate this general framework with the specific example of the noboundary wave function in its holographic form. The implications of these results for model building in string cosmology are discussed. (Abstract) Hattich, Frank. Quantum Processes: A Whiteheadian Interpretation of Quantum Field Theory. Munster: agenda Verlag, 2004. Wherein a physicist and philosopher methodically finds the mathematical formalism of QFT to imply that rather than particles and fields, fluid processes are the essence of reality. In Alfred North’s terms, these dynamics result in a selfcreating, selfcausing, and selfrealizing universe. Hawking, Stephen. A Brief History of Relativity. Time. December 31, 1999. The British physicist and author provides succinct review of modern physics as written for the Albert Einstein “Person of the Century” issue. Hawking, Stephen. Godel and the End of Physics. http://www.damtp.cam.ac.uk/strings02/dirac/hawking. A talk of March 9, 2009 at Texas A&M University at the inauguration of its Mitchell Institute for Fundamental Physics. Hawking sets aside his advocacy of a final theory that natural reality could be reduced to, for this has not worked out. The upshot is a particulate physics in conceptual disarray. Quantum gravity is central to the remedy, along with a recognition of black hole information limits. And please note herein Stuart Kauffman’s new essay “Towards a Post Reductionist Science: The Open Universe” which takes off from Hawking to propose a Darwinian kind of cosmic emergence. Hawking, Stephen and Leonard Mlodinow. The Grand Design. New York: Bantam, 2010. When I thought it could not get worse appears this year’s science bestseller with a final paragraph epitaph. One wonders how much is due to the iconic Hawking, or Mlodinow, whose prior book was the Drunkard’s Walk about how nature’s hopeless unpredictability. The present work has rightly been denounced as neither Grand nor a Design, the muddled last hurrah of a Ptolemaic physics. Are people just “mere,” or infinitely more in a Copernican genesis universe? Mtheory is the unified theory Einstein was hoping to find. The fact that we human beings – who are ourselves mere collections of fundamental particles of nature – have been able to come this close to an understanding of the laws governing us and our universe is a great triumph. (181) Hawking, Stephen and Thomas Hertog. Populating the Landscape: A TopDown Approach. Physical Review D. 73/123527, 2006. The legendary British physicist, in collaboration with CERN researcher Hertog, argue that a better way to contemplate our evolving cosmos is from what (or whom) it has developed into, namely we as observers, rather than assuming all states to be determined by and follow from particular initial conditions. This important if difficult paper is reviewed in Science. 442/988, 2006, Physics Today. October 2006, 9, and Physics World. August 2006, 4. A central idea that underlies the topdown approach is the interplay between the fundamental laws of nature and the operation of chance in a quantum universe. In topdown cosmology, the structure and complexity of alternative universes in the landscape is predictable from first principles to some extent, but also determined by the outcome of quantum accidents over the course of their histories. (1235278)
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